/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Trace a ray against the world using object types and return the first blocking hit
TRUE if any hit is found
bool LineTraceSingleByObjectType ( struct [FHitResult](API\Runtime\Engine\Engine\FHitResult) & OutHit, const FVector & Start, const FVector & End, const [FCollisionObjectQueryParams](API\Runtime\Engine\FCollisionObjectQueryParams) & ObjectQueryParams, const [FCollisionQueryParams](API\Runtime\Engine\FCollisionQueryParams) & Params ) const